用 Javascript实现锚点平滑移动.呵呵.刚刚发现一篇js文章,写的不错,偷过来收藏一下

js 代码

<script type="text/javascript">  // 说明 ：用 Javascript 实现锚点(Anchor)间平滑跳转 // 来源 ：ThickBox 2.1 // 整理 ：Yanfu Xie [[email protected]] // 网址 ：http://www.codebit.cn // 日期 ：07.01.17  // 转换为数字 function intval(v) {     v = parseInt(v);     return isNaN(v) ? 0 : v; }  // 获取元素信息 function getPos(e) {     var l = 0;     var t  = 0;     var w = intval(e.style.width);     var h = intval(e.style.height);     var wb = e.offsetWidth;     var hb = e.offsetHeight;     while (e.offsetParent){         l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);         t += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);         e = e.offsetParent;     }     l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);     t  += e.offsetTop  + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);     return {x:l, y:t, w:w, h:h, wb:wb, hb:hb}; }  // 获取滚动条信息 function getScroll()  {     var t, l, w, h;          if (document.documentElement && document.documentElement.scrollTop) {         t = document.documentElement.scrollTop;         l = document.documentElement.scrollLeft;         w = document.documentElement.scrollWidth;         h = document.documentElement.scrollHeight;     } else if (document.body) {         t = document.body.scrollTop;         l = document.body.scrollLeft;         w = document.body.scrollWidth;         h = document.body.scrollHeight;     }     return { t: t, l: l, w: w, h: h }; }  // 锚点(Anchor)间平滑跳转 function scroller(el, duration) {     if(typeof el != 'object') { el = document.getElementById(el); }      if(!el) return;      var z = this;     z.el = el;     z.p = getPos(el);     z.s = getScroll();     z.clear = function(){window.clearInterval(z.timer);z.timer=null};     z.t=(new Date).getTime();      z.step = function(){         var t = (new Date).getTime();         var p = (t - z.t) / duration;         if (t >= duration + z.t) {             z.clear();             window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);         } else {             st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;             sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;             z.scroll(st, sl);         }     };     z.scroll = function (t, l){window.scrollTo(l, t)};     z.timer = window.setInterval(function(){z.step();},13); }  </script>

1.  
2. <style type="text/css">
3. div.test {
4.     width:400px;
5.     margin:5px auto;
6.     border:1px solid #ccc;
7. }
8. div.test strong {
9.     font-size:16px;
10.     background:#fff;
11.     border-bottom:1px solid #aaa;
12.     margin:0;
13.     display:block;
14.     padding:5px 0;
15.     text-decoration:underline;
16.     color:#059B9A;
17.     cursor:pointer;
18. }
19. div.test p {
20.     height:400px;
21.     background:#f1f1f1;
22.     margin:0;
23. }
24.  
25. </style>
26.  
27. <div class="test">
28.     <a name="header_1" id="header_1"> </a>
29.     <strong onclick="javascript:scroller('header_4', 800);">header_1 --> header_4 </strong>
30.     <p> </p>
31. </div>
32.  
33. <div class="test">
34.     <a name="header_2" id="header_2"> </a>
35.     <strong onclick="javascript:scroller('header_5', 800);">header_2 --> header_5 </strong>
36.     <p> </p>
37. </div>
38.  
39. <div class="test">
40.     <a name="header_3" id="header_3"> </a>
41.     <strong onclick="javascript:scroller('header_6', 800);">header_3 --> header_6 </strong>
42.     <p> </p>
43. </div>
44.  
45. <div class="test">
46.     <a name="header_4" id="header_4"> </a>
47.     <strong onclick="javascript:scroller('header_7', 800);">header_4 --> header_7 </strong>
48.     <p> </p>
49. </div>
50.  
51. <div class="test">
52.     <a name="header_5" id="header_5"> </a>
53.     <strong onclick="javascript:scroller('header_3', 800);">header_5 --> header_3 </strong>
54.     <p> </p>
55. </div>
56.  
57. <div class="test">
58.     <a name="header_6" id="header_6"> </a>
59.     <strong onclick="javascript:scroller('header_2', 800);">header_6 --> header_2 </strong>
60.     <p> </p>
61. </div>
62.  
63. <div class="test">
64.     <a name="header_7" id="header_7"> </a>
65.     <strong onclick="javascript:scroller('header_1', 800);">header_7 --> header_1 </strong>
66.     <p> </p>
67. </div>
68.  

 

调用方式：
Code:

scroller(el, duration)

el : 目标 锚点 ID
duration : 持续时间，以毫秒为单位，越小越快